Maybe if I install it on my router or something?
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That’s the job of the firewall on your router not a VPN.
Setting up a VPN on your router can secure your entire network, including smart home devices, by encrypting their connections and shielding them from potential hackers. Just make sure your VPN has good speeds, since all your devices will be routed through it.
Yes, you can install a VPN on a router and it does create a bubble. Express even has special routers. It keeps your IPs safe, unnecessary threats outside of the system. For complete security though, you’ll still have to keep your passwords secure, enable MFA on important accounts, and stay away from shady sites. A VPN helps but it isn’t a cure-all for hacking.
Data from your smart home devices is already encrypted. A VPN won’t stop hackers or anything like that